Envelope sleeve



FIG. 1 is a front view of an envelope sleeve according to my new design, wherein the envelope sleeve is in a closed or folded configuration;

FIG. 2 is a rear view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front view of the envelope sleeve of FIGS. 1 to 6, but wherein the envelope sleeve is in an open or unfolded configuration;

FIG. 8 is a left view thereof;

FIG. 9 is a rear view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a top view thereof; and,

FIG. 12 is a bottom view thereof.

The broken lines in the figures indicate environment and form a part of the claimed design. 

CLAIM The ornamental design for an envelope sleeve, as shown and described. 